The 15x7 5x4.50 4.0" Bkspc are the same bkspc as the 17x7s on that car. I've been looking at the 15x7s, too, for a good while. I have seen the 15x7s on 1970 B-bodies and they look good, as to spacing in the rear wheel wells, laterally. The repro 15x7 Magnum 500s can be had in 15x7 with 4.25"...